Ok so Kassadin definitely needs buffs after 8.2
I understand that Kassadin's passive and hyper scaling means that he is supposed to have a weaker lane but his laning should not handicap him to the point of becoming a harass pinata where he lacks the ability to trade back any damage at all.
Now Kassadin is down to a 45% winrate just because of the targeted spells changes. Cassiopeia has also dropped 1-2% and could probably use a buff to although her laning is definitely a lot better than Kassadin's right now. The targeted spells change was aimed at top lane but ended up affecting mid laners more than Pantheon or Teemo.
is still trash